The way downed characters and/or the help action work should probably be changed.
Today I fought the Spectator, which I'm guessing is supposed to be a difficult fight considering its high amount of hit points and powerful attacks.
But it's virtually impossible to lose to it.
Every turn it will damage one character and try to paralyze another. In my encounter it focused damage on Lae'zel.
But the problem is that as soon as Lae'zel is downed, I can just use the help action, then it kills her again, I help, repeat.
As long as I have a character near Lae'zel she won't ever die, and so I won't ever lose, and I would guess that this is the case with a lot of other bosses that are faced on their own.